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Foundation Physics And Electricty For It Question Paper
Foundation Physics And Electricty For It
Course:Bachelor Of Science In Information Technology
Institution: Masinde Muliro University Of Science And Technology question papers
Exam Year:2009
EXAMINATION FOR BACHELOR OF SCIENCE DEGREE IN INFORMATION
TECHNOLOGY
FOUNDATION PHYSICS AND ELECTRICTY FOR IT
DATE: NOVEMBER 2009 TIME: 1½HOURS
INSTRUCTIONS: Answer any THREE questions
Constants Speed of sound in air 340ms-1
Speed of light (c) = 3x108ms-1
Acceleration due to gravity (g) = 9.8ms-2
Charge of an electron = 1.6x10-19C
QUESTION ONE [20 Marks]
a) Standards used in measurement must be invariable and accessible. Define these two terms.
[4 Marks]
b) Name two fundamental quantities and their SI units of measure [2 Marks]
c) State Newtons first and second law of motion, and give the mathematical expression of each
[4 Marks]
d) Make the following conversions
(i) 283Km/hr2 to m/s2
(ii) 0.00034A to µA [6 Marks]
e) Differentiate between a vector quantity and a scalar quantity, hence give two examples of each [4 Marks]
QUESTION TWO [20 Marks]
a) Classify the following quantities as either vector or scalar; mass, distance, displacement,
momentum, temperature, time [3 Marks]
b) Three forces act on a 4.80Kg mass as shown in fig 3.1.
i).Calculate the net force [6 Marks]
ii). Calculate the acceleration [2 Marks]
iii). Calculate the displacement in 7.81seconds. [2 Marks]
c) A rock is dropped from the roof of a building. If it takes 2.43 seconds to reach the ground estimate the height of the building [2 Marks]
d) Explain the term projectile hence show that an object projected at an angle of 45o will go further than one projected at 65o [5 Marks]
QUESTION THREE [20 Marks]
a) Define the terms diffraction and refraction. [4 Marks]
b) Light is electromagnetic wave.
i). Using a waveform diagram show this
ii). Hence explain what a transverse wave is. [4 Marks]
c) Define the terms photon and electron [4 Marks]
d) State two characteristics of photons that make them a better choice than electrons in some applications [2 Marks]
e) Define the term photoelectric emission. Hence explain the relationship between photons and electrons [4 Marks]
f) Calculate the frequency of blue light of wavelength 4.11nm [2 Marks]
FA=11.00N at 25o
FB=7.00N at 140o
FC=16.00N at 233o
QUESTION FOUR [20 MARKS]
a) Define the term wave and sketch a longitudinal wave [4 Marks]
b) Some properties of waves include frequency, speed and amplitude. Discuss these three
properties briefly with respect to sound waves [6 Marks]
c) Give meaning to the terms attenuation and reflection, then explain the effect of each on sound
transmission [4 Marks]
d) A closed pipe produces a mi sound of frequency 330Hz as its fundamental note. Calculate the pipe length in cm. [2 Marks]
e) State four reasons why sound is not used as a medium of data transmission
[4 Marks]
QUESTION FIVE [20 Marks]
a) Define the terms current, voltage and charge [3 Marks]
b) Below (fig 5.1) is a circuit diagram. Redraw the circuit using standard symbols
i). Use it to show the four main parts of a circuit. [4 Marks]
ii). Explain the advantage of connecting devices in parallel as shown.
[2 Marks]
iii). In what other way may these bulbs be connected? Draw a circuit showing this.
[3 Marks]
iv). If each bulb has a resistance of 150O calculate total resistance, total current and power
dissipation [6 Marks]
Fig 5.1
bulb
+
12V
c) Explain why some materials are better conductors of electricity than others. [4 Marks]
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